LIU, Z.-Y. Qualitative Reasoning about Physical Systems with Multiple Perspective. AI Magazine, [S. l.], v. 14, n. 1, p. 77, 1993. DOI: 10.1609/aimag.v14i1.1037. Disponível em: https://ojs.aaai.org/aimagazine/index.php/aimagazine/article/view/1037. Acesso em: 23 apr. 2024.